Strain distributions made visible with image-shearing speckle pattern interferometry
Strain distributions made visible with image-shearing speckle pattern interferometry
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DOI：
10.1016/0143-8166(95)00140-9
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发表时间：
1997-03
影响因子：
4.6
通讯作者：
H. A. Aebischer;S. Waldner
中科院分区：
文献类型：
--
作者：
H. A. Aebischer;S. Waldner
由于缺乏一种有效的抑制面外位移导数的方法，用图像剪切散斑干涉法测量面内应变一直受到阻碍。本文提出了一种简单的光学装置，其中三个光源以特定的对称排列，并提出了一个相关的程序，该程序可以准确地隔离所有六个位移导数，这有助于在图像剪切散斑干涉术中形成条纹。该方法采用相移技术，并在具有中心孔的矩形拉伸试样的变形上进行了演示。将测得的面内应变分量与有限元分析结果进行了比较。获得高质量的条纹图案，显示甚至局部应变浓度。本文提出的光学装置非常适合于工业环境中的应用，并且分离位移导数的相关程序可以很容易地自动化。
The measurement of in-plane strain with image-shearing speckle pattern interferometry has so far been impeded by the lack of an efficient method for suppressing the out-of-plane displacement derivative. This paper presents a simple optical set-up with three light sources arranged in a particular symmetry and an associated procedure which allows accurate isolation of all six displacement derivatives which can contribute to the formation of fringes in image-shearing speckle pattern interferometry. The method uses a phase-shifting technique and is demonstrated on the deformation of a rectangular tensile specimen with a central hole. The measured in-plane strain components are compared with the results of finite element analysis. High quality fringe patterns are obtained which reveal even localized strain concentrations. The optical set-up proposed in this paper is well suited for applications in an industrial environment, and the associated procedure for isolating the displacement derivatives can easily be automated.